Postfix completion: apply throw template on Throwable only

java/java-impl/src/com/intellij/codeInsight/template/postfix/templates/ThrowExceptionPostfixTemplate.java

@@ -19,6 +19,7 @@ import com.intellij.codeInsight.template.postfix.util.PostfixTemplatesUtils;
 import com.intellij.openapi.editor.Document;
 import com.intellij.openapi.editor.Editor;
 import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiExpression;
 import org.jetbrains.annotations.NotNull;
 
 public class ThrowExceptionPostfixTemplate extends PostfixTemplate {
@@ -28,7 +29,8 @@ public class ThrowExceptionPostfixTemplate extends PostfixTemplate {
 
   @Override
   public boolean isApplicable(@NotNull PsiElement context, @NotNull Document copyDocument, int newOffset) {
-    return getTopmostExpression(context) != null;
+    PsiExpression expression = getTopmostExpression(context);
+    return expression != null && PostfixTemplatesUtils.isThrowable(expression.getType());
   }
 
   @Override

java/java-impl/src/com/intellij/codeInsight/template/postfix/util/PostfixTemplatesUtils.java

@@ -56,6 +56,11 @@ public abstract class PostfixTemplatesUtils {
     return type != null && InheritanceUtil.isInheritor(type, CommonClassNames.JAVA_LANG_ITERABLE);
   }
 
+  @Contract("null -> false")
+  public static boolean isThrowable(@Nullable PsiType type) {
+    return type != null && InheritanceUtil.isInheritor(type, CommonClassNames.JAVA_LANG_THROWABLE);
+  }
+
   @Contract("null -> false")
   public static boolean isArray(@Nullable PsiType type) {
     return type != null && type instanceof PsiArrayType;

java/java-tests/testData/codeInsight/template/postfix/templates/throw/notThrowable.java

@@ -0,0 +1,5 @@
+public class Foo {
+    void m(Object o) {
+        o.throw<caret>
+    }
+}

java/java-tests/testData/codeInsight/template/postfix/templates/throw/notThrowable_after.java

@@ -0,0 +1,5 @@
+public class Foo {
+    void m(Object o) {
+        throw o;<caret>
+    }
+}

java/java-tests/testData/codeInsight/template/postfix/templates/throw/simple.java

@@ -1,5 +1,7 @@
+import java.lang.RuntimeException;
+
 public class Foo {
-    void m(Object o) {
-        o.throw<caret>
+    void m() {
+        new RuntimeException("error").throw<caret>
     }
 }

java/java-tests/testData/codeInsight/template/postfix/templates/throw/simple_after.java

@@ -1,5 +1,7 @@
+import java.lang.RuntimeException;
+
 public class Foo {
-    void m(Object o) {
-        throw o;<caret>
+    void m() {
+        throw new RuntimeException("error");
     }
 }